This textbook for a one or two-semester course in structured FORTRAN uses a computational approach and moves at a quick pace. The student is not burdened with unnecessary elementary programming material already mastered, and the instructor can move directly to material of importance to engineers or scientists. Full coverage of Fortran 77 language plus coverage of forthcoming FORTRAN 8x is provided. In this modern structured approach, language elements are defined using structure charts. Complete programs, used as examples, are presented early in the text with corresponding explanations. Loops are clearly defined. Functions and subroutines are introduced early. Program development is shown in a top-down, modular fashion using a simple pseudo-code to istill or reinforce good programming habits and serve as a model for writing properly structured, well-designed programs. Full chapters are devoted to error avoidance, detection, and correction, efficiency, and transportability. State-of-the-art use of FORTRAN is reflected in coverage of such topics as FORTRAN"s use with vector super computers.